642454100026 has 8 divisors (see below), whose sum is σ = 963819889920. Its totient is φ = 321180803388.

The previous prime is 642454100009. The next prime is 642454100107. The reversal of 642454100026 is 620001454246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×642454100026² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642454099964 and 642454100000.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23105946 + ... + 23133733.

It is an arithmetic number, because the mean of its divisors is an integer number (120477486240).

Almost surely, 2^642454100026 is an apocalyptic number.

642454100026 is a deficient number, since it is larger than the sum of its proper divisors (321365789894).

642454100026 is a wasteful number, since it uses less digits than its factorization.

642454100026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46246628.

The product of its (nonzero) digits is 46080, while the sum is 34.

The spelling of 642454100026 in words is "six hundred forty-two billion, four hundred fifty-four million, one hundred thousand, twenty-six".